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a. Capable of or subject to change or alteration.
b. Prone to frequent change; inconstant: mutable weather patterns.
2. Tending to undergo genetic mutation: a mutable organism; a mutable gene.
[Middle English, from Latin mūtābilis, from mūtāre, to change; see mutate.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.